| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a gypsum board capable of forming a projected corner part capable of configuring a semi-fireproof structure based on a ministerial ordinance.SOLUTION: A gypsum building material includes one surface and the other surface positioned on the side opposite to the one surface. The gypsum building material has a curved part that is obtained by applying chamfering to a corner part including one side of at least the one surface.</p> |
